Hi tougar,
If you are having problems with a brand new dryer you should not attempt any repairs. The machine will still be in warranty and Sears will send someone to solve the problem for you. If you attempt a repair on the machine you will void your warranty.
Call 1(800)473-7247

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could ber one of a couple things.
1 the exhaust line is clogged. I know this sounds silly but if the hour air can't get out properly it throws off the entire cycle and it won't warm up right.
2 the thermostat could be bad
3 the fan could be not spinning due to being cracked or otherwise messed up

The
Kenmore 80 Series of dryers are consumer grade dryers for home use. As
with most home appliances, the Kenmore 80 series dryers will
occasionally not work as intended. If a problem occurs with your dryer,
however, you do not necessarily need it serviced by a technician. You
can attempt to troubleshoot and fix any problems with your dryer before
contacting a technician.

Kenmore 80 Series dryers may not run for several reasons. First, make
sure that the power cord is plugged into a working power outlet. You
may need to plug a different device into the outlet to check that it is
receiving power. If the second device does not run on the power outlet,
you may have blown a fuse or tripped a circuit breaker. Check your fuse
box or circuit breaker box and make the change as needed. Next, make sure that the dryer door is fully shut. The dryer will not run with the door ajar.Finally,
check that the "Start" button was fully pressed and that a cycle was
chosen on the machine. If you do not choose a cycle for the dryer, it
will not run.

If your Kenmore 80 Series dryer does not heat up during use, check that
a heat cycle has been chosen for the load. There are several different
dryer cycles you can choose, some of which do not use heat. Make sure
that you have chosen a heated cycle.As
above, check that you have not blown a fuse or tripped a circuit
breaker. The dryer may use more than one fuse or breaker: one is used
to power the drum, and the other for the heating element. Make sure
that both fuses or breakers are in working order.

There may be times when Kenmore Series 80 dryers do not fully dry your
clothes. When this occurs, check the lint screen and clear out any
lint. The air may not flow as well if the lint screen is clogged.Next,
check to see if the exhaust vent is clogged. Lint and other particles
may clog the exhaust vent over time, restricting air flow and making it
more difficult to dry your clothes. To check the vent, run the dryer
and hold your hand under the vent. If you do not feel any air flow,
clean or replace the vent.If you used cold water to rinse the
clothes it may take longer than normal to dry. The same is true if the
load of laundry is very wet or is filled with items that are very
absorbent.Finally, check the load size. The more clothes in the
load the longer it will take to dry. If you want to reduce drying time,
separate the clothes into piles of light and heavy items and dry them
separately.

I was thinking you have a bad circuit breaker. This dryer runs on a 2 pole 30 amp 240 volt breaker. The motor runs on one side of the breaker on 120vac. The heater has to have 240 volts to work correct. When that breaker is on the way out it will take a new dryer 3 or four times as long to dry the clothes. If you are cleaning the lint filter out and don't have a clogged vent pipe then in my opinion you have a bad circuit breaker. Seen it.

First off.. befor we talk about changing parts you need to verify that your circuit breakers are set properly. Manually push the dryer CB to the off position... and PUSH to off with conviction then turn it back on again. Test your high heat setting once again. If it works you had one of 2 CB's tripped. If it still shows the same symptoms then there are a couple of suspects.

why didn't you just wait till you got the fuse?you blew the first fuse because something is wrong and overheating it,you might have just needed to clean out the dryer because that's usually the cause of poping them now you might have cooked wires or anything else,not smart,what fuse did you jump out and send complete model number

OK everyone, my ears are red. Over the weekend, I gave this another shot, since my warranty repair appointment isn't until next week.

I opened the dryer door (the drum light is off, indicating no power at all) and went to the circuit breaker box, and flipped the washer/dryer breaker back to off and then re-set the breaker again.

When I got to the laundry room - the drum light was on!

So I powered up the unit, and ran the machine. It ran for about one minute, and then went off. So I went back and re-set the breaker again.

Visually, the breakers did NOT LOOK tripped - but flipping the thing off and then on to re-set the breaker worked.

This time, the dryer is working fine. The bad part is: I need to replace the breaker for the second time. So this is NOT a defective dryer, it is a bad electrical supply. I will call the electrician back to make him fix this right. . . . .

Thanks again for all who responded. This is a new unit, purchased on 7/7/2009.

dryers take a lot of power to run.the circuit is tripping because it cannot take the load of the dryer.you may have to get a dryer line installed.check the value on the circuit breaker.u need to use twice that value on the dryer.with clothes added to the dryer the motor takes more current to spin.this extra current is greater than the circuit breaker value so it trips to prevent the house wire from going on fire.